Effects of ultrasound assisted Fenton treatment on textile dyeing sludge structure and dewaterability
Effects of ultrasound assisted Fenton treatment on textile dyeing sludge structure and dewaterability
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DOI：
10.1016/j.cej.2013.12.064
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发表时间：
2014-04
影响因子：
15.1
通讯作者：
Xun-an Ning;Chen Hong;Jianrong Wu;Yujie Wang;Jingyong Liu;Meiqing Lin
中科院分区：
文献类型：
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作者：
Xun-an Ning;Chen Hong;Jianrong Wu;Yujie Wang;Jingyong Liu;Meiqing Lin
研究了超声辅助Fenton （US/Fenton）处理对纺织印染污泥理化性质的影响。通过测定污泥粒径、总有机碳（TOC）、胞外聚合物质（EPS）浓度和污泥崩解度（DDSCOD），了解污泥理化性质的变化。结果表明，US/ fenton处理污泥在破坏污泥絮体结构方面优于fenton处理污泥。在较低的pH值（≤3）和0.12 ~ 0.16 W/ml（超声密度）条件下，污泥溶解相TOC通过释放污泥絮凝体中的有机物而明显增加。在US/Fenton处理过程中，污泥脱水性能的变化依赖于污泥的分解。污泥脱水效果最佳的EPS浓度为90 ~ 100 mg/l， ddscod浓度为4 ~ 6%。Fenton和US/Fenton处理10 min后，羟基自由基（自由基dotOH）分别为2.71 μmol/l和2.90 μmol/l，证实US/Fenton处理具有协同作用。
The effect of ultrasound assisted Fenton (US/Fenton) treatment on the physicochemical properties of textile dyeing sludge was investigated in this paper. The sludge particle size, total organic carbon (TOC), extracellular polymeric substance (EPS) concentration and sludge disintegration degree (DDSCOD) were measured in an attempt to understand the observed changes in sludge physicochemical properties. The results showed that the US/Fenton-treated sludge presented obvious advantages over the Fenton-treated sludge for disrupting sludge floc structure. The suitable condition for sludge disintegration was found to be 0.12–0.16 W/ml (ultrasonic density) and lower pH (⩽3), under which the TOC in soluble phase increased obviously by releasing organic substances of sludge flocs. The changes of sludge dewaterability were dependent on sludge disintegration during US/Fenton treatment. The optimal EPS concentration and DDSCODto obtain maximum sludge dewaterability were found to be 90–100 mg/l and 4–6%, respectively. After 10 min of Fenton and US/Fenton treatment, the hydroxyl radical (radical dotOH) was 2.71 μmol/l and 2.90 μmol/l, respectively, which confirmed that US/Fenton treatment had a synergetic effect.